OBJECT SOUND EXTRACTION APPARATUS, OBJECT SOUND EXTRACTION PROGRAM AND OBJECT SOUND EXTRACTION METHOD

摘要

PROBLEM TO BE SOLVED: To ensure high object sound extraction performance (noise removing performance) by suppressing musical noise when an acoustic signal obtained through a plurality of microphones includes an object sound and other noises (non-object sounds), and the including state is changeable.;SOLUTION: In an object sound extraction apparatus, a reference sound separation signal corresponding to a reference sound other than an object sound is separated and generated on the basis of a main acoustic signal and a sub acoustic signal, and a signal level of the reference sound separation signal is detected. When the detected signal level is within a predetermined range, a frequency spectrum of a reference sound corresponding signal is compressed and corrected at a large compression ratio as the detected signal level becomes small, and the frequency spectrum of the reference sound corresponding signal obtained by the compression and correction is subtracted from a frequency spectrum of an object sound corresponding signal corresponding to the main acoustic signal, whereby the acoustic signal corresponding to the object sound is extracted from the object sound corresponding signal, and the acoustic signal is outputted.;COPYRIGHT: (C)2009,JPO&INPIT